Electric burglar-alarm system.



J. P. WILLIAMS.

ELECTRIC EUEGLAE ALARM SYSTEM.

APPLICATION FILED APR.27, 1910.

Patented 0013. 27, 1914.

hmmm.

W Wwf. WWW fmwagwizw Y WWW UNITED sTATEs PATENT oFETeE.

JOHN 1. WILLIAMS,

OF NEW YORK, N. Y., ASSIGNOR T0 ELECTRC BANK PROTECTION COMPANY, A CORPORATION OF DELAWARE.

ELECTRIC BURGLAR-ALARM SYSTEM.

Specification of Letters Patent.

Patented Oct. 27, i914.,

To all 'whom it may concern.

Be it known that I, JOHN P. WILLIAMS, a citizen of the United States, and reside-nt of New York, in the county and State of New York, have invented certain new and useful mprovemcnts in Electric Burglar- Alarm Systems, of which the following is a specification. i

rl`his invention relates to electric burglaralarm systems, and it has particular relationto an improved protected alarm structure comprised in such systems.

The object of my invention is to provide a simple and improved burglar-alarm system in which the protected alarm structure will be itself protected either electrically or mechanically or both electrically and mechanically independently of the main protected structure and independently of the circuit connections between the main protected structure and the protected alarm structure.

l'n the drawings- Figure l is a diagrammatic representation of the main parts of a burglar-alarm system embodying my improvements, the protected alarm structure being shown in cross-section. Fig. 2 is a detail plan view illustrating the ypreferred arrangement of the thermostatic cable ele- Scment with relation to the casing plates of the protected alarm structure. 'F ig. 3 is a detail cross-section of one type of thermostatic cable.

Corresponding parts in all the figures are denoted by the same reference characters.

Referring to the drawings, the dotted lintl 1 indicates the guarded structure or main structure protected bv the burglaralarm system. The guarded structure as `herein indicated may be the vault, safe, or

other structure which it is desired to protect in a bank or other building, or the building or apartment itself or a part thereof. ln the type of burglar-alarm systems to which my improvements particularly relate, the main guarded structure Il is itself electrically protected in a suitable manner so that y an attack upon the same or an attempt to gain entrance thereto will sound an alarm, this electrical protection usually comprising batteries and circuits, switches and relays and other devices arranged within the guarded structure, and said circuits are connected by a cable, usually exposed and itself protected, extending to an alarm structure suitably located and containing the alarm. The alarm structure is indicated at 2, and it usually comprises a suitable casing containing the operative parts of the alarm mechanism. The alarm structure 2 may be located atI any desired point Where it is desii-ed to sound an alarm by action of the electrical protective means of the main guarded structure 1, bu.: it is usually and preferably placed upon the outside of tne bank building or apartment or structure within which is located the guarded' structure l, Where it is exposed to View. Heretofore, the alarm structure Q has been itself electrically protected against an attack upon it or an attempt to gain entrance thereto for the purpose of disabling or destroying the alarm mechanism contained therein, by direct connection with the main circuits carried by the cable extending from the main guarded structure 1 to the alarm structure and operating through the batteries and trips and relays or other circuit-connection devices contained Within the main guarded structure l. The result of the conditions juststated is that, should the cable connection between the guarded structure i and alarm structure 2 be disabled or these structures be electrically disconnected in any manner, an attack could then be made upon the alarm structure 2, which is exposed to view and readily accessible, for instance upon the street Wall of the. building, and

the alarm means contained therein could'be disabled or destroyed and the system thus rendered inoperative.

My invention comprises improvements whereby the alarm structure 2 is itself effectively protected independent of any circuit connections With the main guarded structure 1 or through the cable extending between the latter and the alarm structure, whereby the alarm structure is operatively protected entirely within itself and Without dependency upon any external or supplementary source of electrical connection or` current supply. The protected alarm structure 2, in my invention and improvements, thus constitutes in itself an independent and effective burglar-alarm system whereby the alarm cannot be disabled with out the sounding thereof, in case of an attack upon the alarm structure, whatever may be the electrical conditions of the main guarded structure 1 or the rircuits in the connecting cable extending therefrom.

The protected alarm structure, 2, comprised in my invention, embodies a suitable casing forming an inclosure the main walls of which preferably consist of an outer plate, 3, and an inner plate, 4, separated from each other and insulated, as at 5. Within this structure is arranged the battery or other source of electrical energy for independently protecting the alarm structure, and in the circuit arrangement hereinl indicated I have shown two batteries in series, as at 6 and 7. The alarm signal is also housed within the structure 2, and is herein shown as consisting of a suitably mounted gong, 8. Air electro-magnet device, as at,l 9, of usual construction, is also mounted within the structure2 and comprises the .usual hammer, 10, for sounding the gong. The foregoing mechanism, in connection: with the circuits through the batteries -nclosed by the alarm structure, as hereinafter described, will eect the electrical sounding of the'alarm. In addition to such electrical mechanism, I also preferably provide Within the alarm structure 2 mechanical means, as at 11, for sounding the alarm. Such mechanical means may be of any suitable or adapted construction, for instance an arrangement similar to that shown in the patent to M. F. Juruiclc No. 1,038,594,

granted September 17, 1912, and as herein illustrated said mechanism comprises a spring-motor, 12, adapted to actuate a pivoted hammer, 14, in contact with the gong 8, said spring-motor being normally locked by the engagement of a pivoted lever, as at 15, with a notch or shoulder, 16, on a plate or member, 17 in connection with the spring mechanism. The lever 15 is adapted to be operated by action of an electro-magnet, 18, to release it from engagement with the spring mechanism, and in the preferred construction herein illustrated said lever is of right' angular or bell-crank construction with one arm Aadapted for locking engagement with the spring mechanism and the other arm carrying the armature, 19, of the electromagnet 18.

The front of the protected alarm structure 2 is preferab y of open-work construction, as is usual with these structures, to permit the emission of sound when the alarmdis operated, and in the construction as herein illustrated I have shown a preferred form in which an open shutter, 20, is formed of a series of inclined plates in relatively-overlapping position, andin rear thereof is arrangedr a protective wire network, 2 1, backed by a perforated plate, 22. The member 22 is suitably insulated from the members 2l and .20, as at 23, and is in connection, by a wire, as at 25, with they inner casing plate 4 of the alarm structure 2, while the members 20 and 21 are in contact with the outer casing plate 3 of the structure 2, whereby the insertion of a metallic instrument in contact with either of the members 20 or 21 and the member 22 will cause the sounding of the alarm. It will be understood that the-circuit connections of the members 20, 21 and 22 may be arranged in any suitable operative manner, and it will also be noted that an attempt to drill through the casing whereby a metallic instrument is brought into contact with the outer plate 3 and the inner plate 4 will also sound the alarm, such parts being in circuit connection with the battery power within the casing of the structure 2, as hereinafter set forth.

My improvements also comprise means for protecting the alarm` structure 2 thermostatically., so that the application of heator flame will result in soundin the alarm. i In carrying out this feature, lgpreferably employ a thermostatic cable, 27, suitably arranged, such a cable being herein shown as extending over the outer face ofthe perforated plate 22 and in the space between the inner and outer plates 3 and 4 of the alarm structure casing, the cable being 4arranged so that it extends continuously with relation to the surface area of the plates, as indicated in Fig. 2. The thermostatic cable may be of any suitable or adapted construction, but I have herein shown a construction in which it consists of a central wire, 28, surrounded and inclosed by a fusing element, 29, around which is provided an 111sulation, 30, over which is wound a wire, 31, inclosed within an outer insulation, 32, whereby the, application of a sufficient degre of heat or flame to cause the fusing of the element29 and the melting of the insulat-ion 30 will short circuit the wires 28 and 31 and cause the sounding of the alarm. The wires 28 and 31 are connected to opposite sides of the battery power contained within the alarm structure 2, by wires, as at 33 and 34, or by connection with the casing plates 3 and 4, or in any other suitable operative manner. The thermostat-ic construction and arrangement asV herein shown is such that an attack upon the protected alarm structure 2 by the application of heat or rllame at practically any point of its casing body will cause the sounding of the alarm.-

The front portion of the protected alarm structure 2' may be mounted and secured in any suitable manner, and preferably comprises a faceplate, 35, to which the members 20, 21 and 22 are connected and which is adapted to normally contact Vwith the outer casing plate 3, while the members 20 and 21 are in electrical connection With said face-plate. But in the evident securing means of said front portion of the alarm structure 2 is preferably comprised a screw,

minata as at 36, the head 'of which is exposed exteriorly of the alarm structure 2 and the stem of which is in operative connection with the lever 15 controlling the `mechanical device for operating the hammer 14. rl`his connection is normally maintained by a notched end, 37, upon t e stem of the screw, engaging a supplementary lever, 38, pivotally carried upon an arm, 39, extending from the fulcrum, 40, of the lever 15, said lsupplementary lever 38 being maintained in engagement with the notched end 37 by a spring. as at 4l. Thus, in the normal operation of the lever 15 and mechanical device 11, by action of the armature 19, the connectionbetween the screw 36 and the lever 15 is maintained, but should an attempt be made to withdraw the screw 36 in an attack upon the protected alarm structure 2, the outward movement of the screw will trip the lever 15 and release the mechanical device 11 and result in the sounding of the alarm by operation of the hammer 14.

The front portion of the protected alarm structure 2, is movably mounted with relation to the casing of the structure. For instance, it may be constituted by a hinged door comprising the members 20, 21 and 22, and in the general arrangement for securing such movable part in position ll may employ screws, as at 42, passing through the faceplate 35 into engagement with an extension of the outer casing plate 3. To. provide for sounding the alarm when said front portion is moved away from the casing of the structure 2, the faceplate 35 preferably carries at its inner face ugs, 24, the inner ends of which normally maintain spring contacts, 26, away from the inner casing plate 4, said spring contacts being in connection with the outer casing plate 3, whereby when the lugs 24 move outwardly from the spring contacts 26, the latter are released and contact with the inner casing plate 4, thus complet- .wdng the circuit and causing the sounding of the alarm.

En general, the circuit arrangements of the devices comprised in the protected alarm structure 2, with the battery source of electrical energy also contained in said structure, may be of any suitable or adapted construction whereby the mechanical device will be released and the alarm sounded vby action of the mechanical hammer 14 or the electro- 4magnet 9 will .be energized to cause the action of the electrically-operated hammer 10.

ll have herein shown a circuit arrangementin which. when the alarm housing istampered with and the plates 3 and 4 therefore brought into electrical connection, the following circuit through an automatic drop, 45, is established: from the positive side of the battery 6, through a wire, 46, plate 3, plate 4, a wire, 60, and the coils ofthe drop 45, the frame of the drop, a Wire, 54, and a wire, '47, to the negative side of the battery 6. This actuates tl'e drop 45 and the circuit through the electric alarm 9 is established as follows: from bell 9, through a Wire 43, plate 3, wire 46, battery 6, wire 47, wire 60, the frame of the drop 45, and then through a wire 44 to the electric alarm 9. The wire 48 is also extended to the armature of a relay, 49, contained within the protected alarm structure 2, and from the contact of said relay a wire, 50, extends through the battery 7 to the wire 46. In the circuit connections with the battery, the wire 47 is extended to the frame of the automatic drop 45, as at 54. With the foregoing arrangement of circuits and operative parts included therein, an attack upon the protected alarm structure 2 under any, of the conditions hereinbefore described, will result in the sounding of the alarm. I preferably also employ a trip wire, as at 51, extending from a normallyopen contact, as at 52, one side of which 1s carried upon the arm of the pivoted lever 15 which carries the armature 19 of the electro-magnet 18, and this trip wire 51 extends to a connection with the inner casing plate, as at 53. The operative oice of the trip wire arrangement is substantially the sameas that of the similar arrangement g5 -to gain entrance to the alarm structure,

without reference 'to or dependency upon any electrical action of the protective means lof the main guarded structure 1 or circuit connections therewith through the cable connecting the guarded structure 1 and the protected alarm structure 2. But the usual electrical connections are provided between the main guarded structure 1 and the alarm structure 2, whereby an attack upon the guarded structure 1 or upon the connecting cable will sound the alarm within the protected alarm structure 2. The circuit connections between the main guarded structure 1 and the protected alarm structure 2 are substantially the same as those shown in the Juruick patent hereinbefore referred to, including closed circuit connections with the mechanical device 1l and open circuit connections with the electrical device 9, whereby the opening of the closed circuit will cause the operation of the mechanical device and the closing of the open circuit will cause the operation of the electrical device, and

reference may be had to said patent for a more detail explanation of the arrangement and operation of such circuits. I have herein shown the cable connection between the main guarded structure 1 and the protected alarm structure 2 as including closed circuit wires, 55 and 56, extending from the relay 49, which are employed to protect the connecting cable against cutting and are not dependently employed for the protection of the alarm structure 2, and open circuit wires, 57 and 58, extending from the electro-- magnet 9 of the electrically-operated hammer 10, which operate to cause the sounding of the alarm when their circuit is closed by action of the protective devices comprised in the main guarded structure 1. The cable connection also includes" an extension of the trip wire 51, whereby the operation of the mechanical device lthrough the cable connections will cause the operation of the electrical means for sounding the alarm and said electrical means will operate continuously until its circuit is again opened. In the arrangement for. ifecting this operation, the extension of the trip wire 51 is carried to the coil of an automatic drop, 61, within the guarded structure 1, and from thence to a normally-closed contact, 62, of said manner as shown in said patent, to

automatic drop. The normally-closed circuit constituted by the wires and 56 has its battery within the guarded structure 11,

as at 63. The wires 57 and 58 of the normally-open circuit are extended respectively ,as follows: the wire 57 through a battery,

64, within the guarded structure 1, to the frame of said automatic drop 61, and the wire 58 to a normally-open contact, 65, the operation of which is governed by the action of said automatic drop 61.

It will be understood that the arrangement and operation of the normally-closed circuit 55-56 and ,the normally-open circuit 57-58 and the trip wire 51, with their sources of electrical energy and the automatic drop 61 arranged Within the main guarded structure f1, is substantially the same as is .shown in the before-mentioned J uruick patent, and ,that these wires are extended in a cable leading to the protected alarm structure 2 in substantially the same overn the operation of the mechanical an electrical alarm means within the protected alarm structure 2 incase of an attack at the guarded structure 1. Butthe extension of the electrical protective system of the main guarded structure 1 to the protected alarm. .structure 2, in the general burglar-alarm system to which my present improvements are adapted and as illustrated in said beforementioned Juruick patent, is not essential to the yoperation of the alarm mechanism Within the protected alarm structure 2 in case of an attack only upon said alarm structure, it being understood that in my present improvements the alarm structure 2 is fully protected in itself without dependence upon any circuit connections with the main guarded structure 1, said alarm structure 2 having its own independent protective circuits and sources of electrical energy therefor entirely within itself and in connection with the inclosed alarm mechanism, whereby it is adapted for independent operation by means of its own circuits and sources of electrical energy when any attempt is made to gain entrance thereto.

With reference to the circuits through the circuit connections with the main guarded structure 1, including the trip wire 51, it will be noted that when the normally-closed circuit 55-56 is opened by an attack thereon and the armature of the relay 49 is thus re- 60 through the coils of said drop to the inner casing plate 4, the wire 48 from said inner casing plate, the armature of the rela 49,and the wire 50 through battery 7 to t e other side of battery 6. When the electro-magnet 18 is thus energized, the mechanically-operating alarm mechanism will be started in operation by the action of the armature 19 ofwsaid electro-magnet, which carries the release lever 15, and the open trip circuit including the wire 51 is then closed and completed as follows: The action of the armature 19 closes the open contact 52 and establishes the following circuit traced from wire 51, through the coil of the automatic drop 61 in the guarded structure 1, the normally-closed contactc62, the frame of the drop 61 and the wire 57 to the negative side of the battery 64 in the guarded structure 1,

through the battery Wire 57, wire 43, the outer casing plate 3, rod 36, contacts 52 and back to wire 5l. This complete trip circuit operates through battery 64 and thus energizes the automatic drop 61 and causes the same to operate to close the normally-open contact 65 thereof, and the electricallyoperated alarm mechanism 9 is then actuated through the circuit completed as follows: from the positive side of the battery 64, throu h the wire 57, the coils of the alarm mec anism 9, the Wire 58,to the closed contact 65, the frame of the automatic drop 61, and the extension of the Wire 57therefrom, to the other or negative side of the battery 64.

rilassa It will be noted that the automatic drop 45 is energized to cuit simultaneously with the energizing of the electro-magnet 18, and a multiple ringing circuit is completed through the electrically-operated alarm mechanism 9 and the battery side of the battery 6, through the wire 47 the wire 54, the frame of the drop 45, the Wire 44 (the contact for which is then closed at the drop 45), the coils of the alarm mechanism 9, the wire 43, the outer casing plate 3 of the protected alarm structure 2, and the wire 46, tothe opposite side of the battery. 6.

If desired, the connecting cable extending between the guarded structure 1 and the protected alarm structure 2 may contain circuit w1res suitably arranged in any 4adapted manner and in connection with any adapted devices, for testing the batteries contained in the protected alarm structure or for indicating the action and service status of these batteries at any time without occasion for entering the protected alarm structure itself.

The general operation and advantages of my invention and improvements will be readily understood by those skilled in the art to which they appertain. The features of the improvements provide a protected alarm structure which constitutes in itself an independent and effective'burglar-alarm system whereby the alarm cannot be disabled without the sounding thereof, and which, in its connection with a general burglar-alarm system embodying a main guarded structure and a main protective circuit or circuits extending to the alarm structure, is effectively protected independent of the main protective circuit or circuits. The general features of improvement as comprised in my invention also have a wide range of application to various different types of alarm systems, Whatever maybe the particular structural characteristicsI of the main system itself, as will be readily understood.

I do not desire to be understood as limiting myself to the detail construction and arrangement of parts or circuits as herein shown and described, as it is manifest that variations and modifications therein may be resorted to, in the adaptation of my invention to varying conditions of use, without departing from the spirit and scope of my invention and improvements. l therefore reserve the right to all such variations and modifications as properly fall within the scope of my invention and the terms of the following claims. 1

Having thus described my invention, I claim and desire to secure by Letters Patent:

l. ln a burglar-alarm system, a structure.

to be guarded, an alarm housing, an alarm mechanism arranged within said housing,

throw the wire 44 inv cir- 6 as follows: from the negative an electrical protective system comprisinga main protective circuit extending between said structure to be guarded and said alarm mechanism, and a supplementary electrical protective system entirely comprised Within said alarm housing and constituting a protective system without dependence upon said main protective system, said supplementary system being operatively independent of said circuit connections between said structure to be guarded and said alarm mechanism, whereby the alarm housing is in itself entirely protected without any dependency upon any part of the main protective system external thereof.

2. In a burglar-alarm system, a structure to be guarded, an alarm housing, an alarm mechanism arranged Within said housing, an electrical protective system comprising a main protective circuit extending between said structure to be guarded and said alarm mechanism, said alarm mechanism comprising mechanically-operating means contained within said alarm housing for actuating the alarm, and a circuit protecting said alarm@ housing and having its source of energy arranged therein and actuating said mechanically-operating means, said circuit for said housing being supplementary to the electrical protection of said structure to be guarded and constituting a protective system without dependence upon said external main protective circuit and operatively independent of any other part of4 the system, whereby the alarm housing is in itself protected through said mechanically-operating means witho-ut dependency upon any part of the main protective system.

8. In a burglar-alarm system, a structure to be guarded, an alarm housing, an alarm mechanism arranged within said housing, an electrical protective system comprising a main protective circuit extending between said structure to be guarded and said alarm mechanism, said alarm mechanism comprising mechanically-operating and electricallyoperating means contained within said alarm housing for actuating the alarm, and a circuit protecting said alarm housing and having its source of energy arranged therein and actuating said mechanically operating and electrically operating means, said circuit for said housing being supplementary to the electrical protection of said structure to be guarded and constituting a protective system without dependence upon said external main protective circuit and operatively independent lof any other part of the system, whereby the alarm housing is in itself entirely protected through said mechanicallyoperating and electricallyoperating means without dependency upon any part of the main protective system.

4. ln a burglar-alarm lsystem, a structure to be guarded, an alarm housing, an alarm mechanism arranged within said housing, an electrical protective system in connection with said alarm mechanism for-protecting thel structure to be guarded, and a supplemental electrical protective system in connection with said alarm mechanism for independently protecting said alarm housing, said supplemental system constituting a protective system without dependence upon said main protective system and operatively independent of any circuit connections with the structure to be guarded, whereby the alarm housing is initself entirely protected Without dependency upon any part of the main protective system external thereof.

5. In a burglar-alarm system, an electrically-protected structure to be guarded, an alarm mechanism in connection with the electrical protection for rsaid structure to be guarded, and a housing for said alarm 'mechanism electrically protected in connection with said alarm mechanism, the elec.- trical protection of the alarm housing constituting a protective system without dependence upon the electrical protection of the structure to be guarded and operatively independent of any other part of the system, whereby the alarm housing is in itself entirely protected without dependency upon any part of the main protective system external thereof.

6. In a burglar-alarm system, an electrically-protected structure to `be guarded, an alarm mechanism in connection with the electrical protection for said structure to be guarded, a housingfor said alarm mecha-4 nism, and a supp mentary electrical protective system ,completely arranged within said alarm housing and in connection with the alarm.mechanism therein and constituting a protective system without dependence upon the electrical protection of the structure to be. guarded and operatively independent of any other part of the system, whereby the alarm housing is in itself entirely protected without dependency upon any part of the main protective system external thereof. I

7. Ina burglar-alarm system, a structure to be guarded, an alarm mechanism exterior of said structureV to be guarded, a main electrical protective system having its source of energy arranged within said structure to be guarded and extending therefrom to said alarm mechanism, a housing for said alarm mechanism, and a supplementary electrical protective system having its source of energy arranged within said alarm housing and in connection withl the alarm mechanism therein and constituting a protective system without dependence upon the electrical protection of the structure to bey guarded and operatively independent of any other part of the system,

vwhereby the alarm housing is in itself entirely protected without dependency upon any part of the main protective system external thereof.

8. In a burglar-alarm system, a structure to be guarded,l an alarm mechanism exterior of said structure to be guarded, a housing for said alarm mechanism, means for electrically protecting said structure to be guarded in connection with said alarm mechanism, and supplementary means for electrically protecting said alarm housing in connection with said alarm mechanism, said supplementary means constituting a protective system without dependence upon the electrical protection of the structure to be guarded and operatively independent of any other part of the system, whereby the alarm housing is infitself entirely kprotected without dependency upon any part of the main protective system external thereof.

9. In a burglar-alarm system, a structure to be guarded, an alarm mechanism exterior of said structure to .be guarded, means for electrically protecting said structure to be guarded in connection with said alarm mechanism, and a housing for said `,alarm mechanism comprising in itself a complete electrical protective system for actuating VSaid alarm mechanism when an attack is made upon said alarm housing, said electrical protective system for said housing being supplementary to the electrical yprotection of said structure to be guarded and constituting a protective system without dependence upon said main electrical protection and operatively independent of an;7 yother part of the system, whereby the alarm housing is in itself entirely protected without dependency upon any part of the main protective system external thereof.

10. In a burglar-alarm system, an alarm mechanism, a housing-therefor, said alarm mechanism comprising mechanically-operating and electrically-operating means for actuating the alarm, means for locking said mechanically-operating means against operation, and an electric protective circuit comprised within said alarin housing andl in operative connection with said locking means to release the same, said protective circuit being also in connection with said electrically-operating means andl having its source of energy arranged Within said alarm housing, whereby said alarm housing is .electrically protectedfor the actuation of either or both of said mechanically-operating and electrically-operating means independent of any external agency.

11..In a burglar-alarm system, an alarm mechanism, a housing therefor, said alarm mechanism comprising mechanically-operating and electrically-operating means for actuating the alarm, means for locking said mechanically-operating means against op- 1,1 rasca eration, an electric protective circuit comprised within said alarm housing and in operative connection with said locking vmeans to release the same, said protective circuit being also in connection with said electrically-operating means and having its source of energy arranged Within said alarm housing, and supplementary mechanical means exposed exteriorly of the housing for controlling said locking means independently of the action of said electric circuit, whereby said alarm housing is electrically protected for the actuation of either or both of said mechanically-operating and electrically-operating means independent ot any external agency and protected by said supplemental mechanical means independent of the electrical protection.

12. ln a burglar-alarm system, an alarm mechanism, a housing therefor, thermostatic means comprised in said housing and embodying electrical conductors in connection with the alarm mechanism, and a source of electrical energy arranged Within said alarm housing and in connection with said conductors, whereby said alarm housing is electrically protected against the action of heat or flame independent of any external agency.

13. ln a burglar-alarm system, an alarm mechanism, a housing therefor, said alarm mechanism comprisingI mechanically-operating means arranged within said alarm housing, means for locking said mechanically-operating means against operation, an electrical circuit comprised within said housing and controlling said locking means, and a supplementary mechanical member in trip connection with said locking means and exposed exteriorly of said alarm housing, whereby an attack causing movement of said mechanical member will trip said me-.

chanically-operating means and cause the actuation of the alarm independent of the action of said electric circuit.

14. ln a burglar-alarm system, an alarm mechanism, a housing therefor, said alarm mechanism comprising mechanically-operating means arranged within said alarm housing, means for locking said mechanicallyoperating means against operation, an electrical circuit comprised within said housing and controlling said locking means, and a screw in trip connection with. said mechanically-operating means-and exposed esteriori of said alarm housing, whereby an attacli causing movement of said screw will trip said mechanically-operating means and cause the actuation of the alarm independent of the action of said electric circuit. Y

15. ln a burglar-alarm system, an alarm mechanism, a housing therefor, said alarm mechanism comprising mechanically-operating means arranged within said alarm housing, means for locking said mechanicallyoperating means against operation, said locking means having a trlp lever, and a screw the inner end of which is in trip engagement with said trip lever and the head of which is exposed exteriorly of said housing, whereby an attack causing movement of said screw will trip said lever or release the mechanically-operating means and cause the actuation of the alarm.

' 16. ln a burglar-alarm system, an alarm mechanism, a housing theretor, said alarm mechanism comprising mechanically-operating means arranged within said alarm housing, an electric circuit comprised within said housing and controlling the operation of said mechanically-operating means, and amechanical member in trip connection with said mechanically-operating means and exposed exteriorly of said housing, whereby said mechanically-operating means Will be released either electrically through said circuit or by movement of said mechanical member to actuate the alarm.

17. ln a burglar-alarm system, an alarm mechanism, a housing therefor, said alarm mechanism comprising mechanically-operating means arranged within said alarm housing, an electric circuit comprised within said housing and controlling the operation of said mechanically operating means, and a mechanical member in dexible trip connection with said mechanicallyoperating means and exposed exteriorly of said alarm housing, whereby said mechanicallyoperating means will be released either electrically through said circuit 'or by movement or said mechanical member to actuate the alarm and the operation of said' electrical circuit will not ali'ect the normal operative status of said mechanical dexible trip means.

18. ln a burglar-alarm system, an alarm mechanism, a housing therefor, an electrical circuit protecting said housing and controlling said alarm mechanism, and mechanical means exposed exteriorly of said alarm housing and interiorly thereof in mechanical trip connection with said alarm mechanism to cause the actuation of the alarm mechanism by movement of said mechanical means, whereby said alarm housing is mechanicallyprotected against attack by movement of said mechanical means independent of the action of said electric circuit.

19. lln a burglar-alarm system, an alarm mechanism, a housing inclosing the alarm and all -the elements of said alarm mechanism, mechanical means operatively comprised in said alarm mechanism for actuating the alarm, means for locking said mechanically-operating means against operation, and electrical means operatively comprised in said alarm mechanism for actuating the alarm, and an electric protective system inclosed within said housing and in circuit lll@ EMS

vthe alarm, means for locking said mechani cally-operating -means vagainst operation, electrically-operatingmeansl arranged Within said housin and operating to actuate the alarm, an e ectrical protective system comprising a main protective 'circuit extending between said structure to be guarded and said locking means and electrically-operating means within the alarm housing and governing the operation thereof, and a supplementary electrical protective system havlng its source of energy arranged within said alarm housing and in connection with said mechanically-operating and electrically-operating means and governing the operation thereof independently of any operation through said main protective circuit.

21. In a burglar-alarm system, a structure to be guarded, an alarm housing, an alarm mechanism arranged within said housing, an electrical protective system extendin between said structure to be guarded am?V said alarm mechanism, mechanically-operating means contained within said alarm housing for actuating the alarm, means for locking said mechanically-operating means against operation, said locking means being controlled by the electrical protective system, and supplementary mechanical means exposed exteriorly of said Yalarm housing for, actuating said mechanically -operating means independent of any operation of said electrical protective system extending from saidstructure to be guarded, wherebyV Vsaid alarm housing is mechanically independently protected. f l

In testimony whereof I have signed name in the presence of the subscribing witnesses. p e l JOHN P. WILLIAMS. Witnesses:

JAS. D. Woon, IDA A. `MOORE. 

